The fact the US president delayed this decision so long just adds to its potency.

Biden and his advisers are concerned the entry of North Korea troops into the conflict could lead to a dangerous new phase.

Biden authorizes Ukraine to use American missiles against Russia, sparking policy shift and international tensions.

The move is a major change in US policy after months of entreaties from Kyiv.

Russian strike in Sumy kills 8, injures dozens; U.S. approves Ukraine missile use against Russia.

The US has never allowed Kyiv to use long-range missiles for attacks inside Russia proper – until now.

The United States will allow Ukraine to use US-made weapons such as ATACMS rockets, which have a range of up to 306km, to strike deep into Russia.

Russia launched one of its largest attacks in recent months on Ukraine, targeting a nine-story building in Sumy, killing eight people.

What really counts is what President Putin does next, writes the BBC's Steve Rosenberg.

What really counts is what President Putin does next, writes the BBC's Steve Rosenberg.

Ukraine's President Volodymyr Zelensky has said he visited the eastern frontline town of Pokrovsk in Donetsk region.

The UK must "confront" the deployment of North Korean troops alongside Russia in Ukraine, the shadow defence secretary has told LBC.

The move comes two months before President-elect Donald Trump takes office on January 20 and follows months of pleas by Ukrainian President Volodymyr Zelenskyy to allow Ukraine's military to use US weapons to hit Russian military targets far from its border.

The move may not change the course of the war but it could restore balance, writes the BBC's Paul Adams.

US official says decision comes in response to Russia's deployment of thousands of North Korean troops to aid its war effort.

Some observers say we should not be too quick to dismiss Pyongyang's military capabilities.

Britain has been unwilling to let Ukraine send storm shadow missiles into Russia over fears of escalation.

A Ukrainian soldier was filmed successfully shooting down a Russian cruise missile during her first combat launch.

The US has approved sending ATACMS missiles to Ukraine, escalating the Russia-Ukraine conflict. This move could lead to World War 3, with fears of a direct US-Russia clash.

It is not clear if Biden's decision will be endorsed by Donald Trump who has promised to end the Ukraine war.

Over the past 11 days, a staggering third of all Russian vehicles in Kursk have allegedly been destroyed by mines.

The US decision to authorise long-range Ukrainian strikes could help Kyiv defend the foothold in Russia's Kursk region but may come too late to change the course of the war, analysts say.